*EDIT moving request to support

It can take a few hours before the license checks with the license database and completes the upgrade process (honestly, that delay is a bit of a bug).

It should just start working, though you can also click the "Re-Check Virtualmin License" button next to the Virtualmin Version on the Dashboard you see when logging into Virtualmin.

We're happy to help if you have additional questions, though note that we'll see comments quicker in the support tracker than we do here in the Forums.. you may want to post there if you're seeing a delay.